Billed for internet without internet service

We have app**** to Telkom to add an ADSL line to our existing telephone line in the start of Jan 2016. We were told that we have to pay R700 before they will install the line. No technician were at the house till this day. We had to wait for 21 working days for this to be done. We had to call and follow up after the 21 days what is going on. Telkom then told us that the line is activated and that they will let a technician call us to assist with the setup of the internet modem. After a week Telkom phones us to set the modem up, but the person could not assist us. He then told us that he will let another technician phone us that same day. A whole week pass and on 6 Feb 2016 a technician calls when we are not home we told him to call on Monday 8 Feb 2016. This did not happen. We called Telkom on 13 Feb 2016 and finally got someone to help us. This was more than a month of no internet access. Telkom then billed us for Jan 2016 when we did not have any internet connection. This is surely not right!!! The R700 did also not get set off against the invoice for ADSL line. Telkom now claims it is for a deposit for when we cancel our internet. This was not what we have been told at first????